Installing htop on Lion
The homeboys at Homebrew decided to make the "htop" package unofficial, stranding many users. Here's how to get some htop goodness working again.
Fresh Install
brew install autoconf
brew link autoconf
brew install automake
brew install --HEAD https://raw.github.com/adamv/homebrew-alt/master/unmaintained/htop.rb
chmod 6555 /usr/local/Cellar/htop/HEAD/binhtop
sudo chown root /usr/local/Cellar/htop/HEAD/binhtop
Fixing htop after Lion upgrade
Uninstall htop first, then execute the commands above for a fresh install.